Side-by-Side
Feature Comparison
Peptide Sciences
AUREX
Testing Method
Peptide Sciences
Standard HPLC analysis
AUREX
HPLC-MS dual method (chromatography + mass spectrometry)
Purity Standard
Peptide Sciences
Established reputation for quality
AUREX
99%+ purity, independently verified per batch
Manufacturing
Peptide Sciences
Established US-based supplier
AUREX
US manufactured in cGMP-compliant facilities
COA Documentation
Peptide Sciences
Standard HPLC Certificate of Analysis
AUREX
Full COA: chromatogram, mass spectrum, endotoxin, residual solvent
Shipping Speed
Peptide Sciences
2-3 business day shipping
AUREX
Same-day dispatch before 3PM ET
Batch Freshness
Peptide Sciences
Standard batch inventory
AUREX
Batches synthesized within 14 days of order
Cold Chain Packaging
Peptide Sciences
Standard insulated packaging
AUREX
Cold-chain packaging with phase-change gel packs
Context
Why It Matters for Your Research
Why HPLC-MS Outperforms HPLC Alone
HPLC measures chromatographic purity but cannot confirm molecular identity. Mass spectrometry adds exact mass confirmation, detecting co-eluting impurities and degradation products that HPLC alone misses. This is the USP-referenced standard for definitive identification.
Why US Manufacturing Matters
Both suppliers manufacture in the US, which ensures FDA-inspected quality systems. The key differentiator is the depth of analytical documentation and testing methodology — dual-method HPLC-MS versus single-method HPLC analysis.
Why Batch Freshness Matters
Lyophilized compounds follow Arrhenius degradation kinetics — even at optimal storage temperatures, time-dependent potency loss is measurable. A 14-day synthesis-to-ship window ensures maximum starting purity and the longest possible effective shelf life for your research.
Next Step
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Browse CompoundsFor research use only. Not for human consumption. This comparison is based on publicly available information and is intended to help researchers make informed procurement decisions. AUREX does not disparage competitors — all statements reflect factual differences in published methodologies, certifications, and operational practices. Information is accurate as of March 2026.
Related Resources
HPLC vs Mass Spectrometry
Understanding the two primary analytical methods for compound verification.
US vs Overseas Peptides
Quality control and compliance differences in peptide sourcing.
Choosing a Peptide Supplier
A researcher's evaluation checklist for supplier selection.
cGMP vs Non-cGMP Facilities
What cGMP compliance means for research compound quality.